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一起学Python第111天:柱状图进阶指南——从"蓝柱子"到"数据可视化大片"

  • 2026-08-19 06:53:25
一起学Python第111天:柱状图进阶指南——从"蓝柱子"到"数据可视化大片"

📅 系列:一起学Python | 难度:⭐⭐ | 预计阅读:5分钟

🔗 上期回顾:第110天:散点图

一、柱状图:最直观的数据对比武器

柱状图是数据可视化的"基本功",但它绝不只是几根蓝色柱子。

核心优势:人类对"高度"的感知比对"角度"(饼图)和"长度"(表格)更敏感。柱状图让谁高谁低,一目了然

二、核心 API:bar() vs barh()

方法
方向
适用场景
plt.bar(x, height)
垂直柱状图
类别少、标签短(如月份、产品名)
plt.barh(y, width)
水平条形图
类别多、标签长(如城市名、人名)
matplotlib.pyplot.bar(x, height, width=0.8, bottom=None                      align='center', color=None, edgecolor=None)
参数
说明
默认值
x
柱子的X轴位置
必填
height
柱子高度(数值)
必填
width
柱子宽度
0.8
(0~1之间)
bottom
柱子底部起始位置
0
(可堆叠)
align
对齐方式:center居中/edge边缘
center
color
填充颜色
默认蓝色
edgecolor
边框颜色
None

三、从入门到精通:6个实战示例

示例 1:基础柱状图(入门)

import numpy as npimport matplotlib.pyplot as pltimport matplotlib.font_manager as fmimport os# ================= 1. 字体加载(解决报错的核心) =================font_path = "simhei.ttf"  # 确保你已经在当前目录上传了 simhei.ttfif not os.path.exists(font_path):    font_path = "/usr/share/fonts/truetype/wqy/wqy-zenhei.ttc"  # 备用系统字体prop = fm.FontProperties(fname=font_path)plt.rcParams['axes.unicode_minus'] = False# 数据categories = ['产品A''产品B''产品C''产品D']sales = [1222618]plt.figure(figsize=(86))plt.bar(categories, sales)plt.title('各产品销售额', fontproperties=prop, fontsize=16)plt.xlabel('产品', fontproperties=prop)plt.ylabel('销售额(万元)', fontproperties=prop)plt.show()

示例 2:水平条形图——标签太长怎么办?

categories = ['test1', 'test2',               'test3', 'test4']scores = [85, 92, 78, 88]plt.figure(figsize=(106))plt.barh(categories, scores, color='#2E86AB')plt.title('各部门绩效评分', fontproperties=prop, fontsize=16)plt.xlabel('评分', fontproperties=prop)# 在条形右侧添加数值for i, v in enumerate(scores):    plt.text(v + 1, i, str(v), va='center', fontsize=11)plt.xlim(0100)plt.show()

示例 3:自定义颜色——告别"蓝柱子"

categories = ['Q1''Q2''Q3''Q4']sales = [120135148162]plt.figure(figsize=(86))# 统一颜色plt.bar(categories, sales, color='#4CAF50', edgecolor='white', linewidth=1.5)# 或:每个柱子不同颜色colors = ['#FF6B6B''#4ECDC4''#45B7D1''#FFA07A']plt.bar(categories, sales, color=colors, edgecolor='white', linewidth=1.5)plt.title('季度销售额', fontproperties=prop, fontsize=16)plt.ylabel('销售额(万元)', fontproperties=prop)plt.show()

示例 4:调整柱宽——从"胖子"到"瘦子"

categories = ['A', 'B', 'C', 'D']values = [12, 22, 6, 18]fig, axes = plt.subplots(13, figsize=(155))# 宽柱子(width=0.9)axes[0].bar(categories, values, width=0.9, color='#E74C3C')axes[0].set_title('宽柱子 (width=0.9)', fontproperties=prop)# 标准柱子(width=0.5)axes[1].bar(categories, values, width=0.5, color='#2E86AB')axes[1].set_title('标准柱 (width=0.5)', fontproperties=prop)# 细柱子(width=0.2)axes[2].bar(categories, values, width=0.2, color='#27AE60')axes[2].set_title('细柱子 (width=0.2)', fontproperties=prop)plt.suptitle('柱宽对比', fontproperties=prop, fontsize=14)plt.tight_layout()plt.show()

示例 5:数值标注——让柱子"开口说话"

categories = ['1月''2月''3月''4月''5月''6月']sales = [120135148162155178]plt.figure(figsize=(106))bars = plt.bar(categories, sales, color='#2E86AB', edgecolor='white', linewidth=1.5)# 在柱子顶部添加数值for bar in bars:    height = bar.get_height()    plt.text(bar.get_x() + bar.get_width()/2., height + 3,             f'{height}万', ha='center', va='bottom', fontsize=10, color='#333')plt.title('2026年上半年销售额', fontproperties=prop, fontsize=16)plt.ylabel('销售额(万元)', fontproperties=prop)plt.ylim(0200)# 移除上方和右方边框ax = plt.gca()ax.spines['top'].set_visible(False)ax.spines['right'].set_visible(False)plt.show()

示例 6:分组柱状图——对比多组数据

categories = ['Q1', 'Q2', 'Q3', 'Q4']sales_2025 = [100, 115, 130, 145]sales_2026 = [120, 135, 148, 162]x = np.arange(len(categories))width = 0.35plt.figure(figsize=(106))bars1 = plt.bar(x - width/2, sales_2025, width, label='2025年',                 color='#95A5A6', edgecolor='white')bars2 = plt.bar(x + width/2, sales_2026, width, label='2026年',                 color='#2E86AB', edgecolor='white')# 添加数值for bar in bars1:    height = bar.get_height()    plt.text(bar.get_x() + bar.get_width()/2., height + 2,             f'{height}', ha='center', va='bottom', fontsize=9)for bar in bars2:    height = bar.get_height()    plt.text(bar.get_x() + bar.get_width()/2., height + 2,             f'{height}', ha='center', va='bottom', fontsize=9)plt.title('季度销售额对比', fontproperties=prop, fontsize=16)plt.xlabel('季度', fontproperties=prop)plt.ylabel('销售额(万元)', fontproperties=prop)plt.xticks(x, categories)plt.legend(prop=prop)plt.ylim(0180)plt.show()

四、柱状图 vs 条形图:怎么选?

场景
推荐
原因
类别少(<10个)
垂直柱状图
符合阅读习惯,高度直观
类别多(>10个)
水平条形图
标签不重叠,易排序
标签文字很长
水平条形图
避免标签倾斜或截断
需要排名展示
水平条形图
从上到下,排名感更强
时间序列数据
垂直柱状图
时间从左到右,符合直觉

五、参数速查卡

# 垂直柱状图plt.bar(x, height, width=0.8, color='blue', edgecolor='white'        bottom=0, align='center')# 水平条形图plt.barh(y, width, height=0.8, color='green', edgecolor='white')# 常用美化组合plt.bar(categories, values        color='#2E86AB',      # 填充色        edgecolor='white',    # 边框色        linewidth=1.5,        # 边框宽度        width=0.6,            # 柱宽        alpha=0.9)            # 透明度

六、避坑指南

解决方案
柱子太宽/太窄
调整 width 参数,推荐 0.5~0.8
标签重叠
水平条形图,或旋转标签 plt.xticks(rotation=45)
数值标注被截断
调整 plt.ylim() 上限,留出空间
多组数据柱子重叠
使用 x - width/2 和 x + width/2 错位
颜色太单调
使用渐变色或分类配色

总结

今天我们掌握了 Matplotlib 柱状图的核心技能:

  • ✅ plt.bar() —— 垂直柱状图,最常用

  • ✅ plt.barh() —— 水平条形图,长标签救星

  • ✅ width / height —— 控制柱宽,影响视觉密度

  • ✅ color + edgecolor —— 配色美化,告别默认蓝

  • ✅ 数值标注 —— 让数据"开口说话"

  • ✅ 分组柱状图 —— 多组数据对比利器

关键记忆:垂直用 bar(),水平用 barh(),柱宽 0.6~0.8 最美观,数值标注不可少

🎯 今日金句柱状图是数据世界的身高尺——它不问你是谁,只告诉你站在哪里。

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  1. CONNECT:[ UseTime:0.001060s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001604s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003041s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004561s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001487s ]
  6. SELECT * FROM `set` [ RunTime:0.000604s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001546s ]
  8. SELECT * FROM `article` WHERE `id` = 504568 LIMIT 1 [ RunTime:0.000992s ]
  9. UPDATE `article` SET `lasttime` = 1787323987 WHERE `id` = 504568 [ RunTime:0.054686s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.010369s ]
  11. SELECT * FROM `article` WHERE `id` < 504568 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001313s ]
  12. SELECT * FROM `article` WHERE `id` > 504568 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001024s ]
  13. SELECT * FROM `article` WHERE `id` < 504568 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004141s ]
  14. SELECT * FROM `article` WHERE `id` < 504568 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005565s ]
  15. SELECT * FROM `article` WHERE `id` < 504568 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001976s ]
0.261443s